Rainbow Electronics W90N745CDG - Manual (Page 167)

W90N745CD/W90N745CDG
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Continued
BITS DESCRIPTIONS
[13:12] TWS
Transfer Width Select
00 = One byte (8 bits) is transferred for every GDMA operation
01 = One half-word (16 bits) is transferred for every GDMA operation
10 = One word (32 bits) is transferred for every GDMA operation
11 = Reserved
The GDMA_SCRB and GDMA_DSTB should be alignment under the
TWS selection
[11] SBMS
Single/Block Mode Select
1’b0 = Selects single mode. It requires an external GDMA request for
every incurring GDMA operation.
1’b1 = Selects block mode. It requires a single external GDMA request
during the atomic GDMA operation. An atomic GDMA operation is defined
as the sequence of GDMA operations until the transfer count register
reaches zero.
[10] Reserved -
[9] BME
Burst Mode Enable
1’b0 = Disables the 4-data burst mode
1’b1 = Enables the 4-data burst mode
FF there are 16 words to be transferred, and BME [9]=1, the
GDMA_TCNT should be 0x04;
However, if BME [9]=0, the GDMA_TCNT should be 0x10.
[8] SIEN
Stop Interrupt Enable
1’b0 = Do not generate an interrupt when the GDMA operation is
stopped
1’b1 = Interrupt is generated when the GDMA operation is stopped
[7] SAFIX
Source Address Fixed
1’b0 = Source address is changed during the GDMA operation
1’b1 = Do not change the destination address during the GDMA
operation. This feature can be used when data were transferred from a
single source to multiple destinations.
[6] DAFIX
Destination Address Fixed
1’b0 = Destination address is changed during the GDMA operation
1’b1 = Do not change the destination address during the GDMA
operation. This feature can be used when data were transferred from
multiple sources to a single destination.
[5] SADIR
Source Address Direction
1’b0 = Source address is incremented successively
1’b1 = Source address is decremented successively